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Chemistry CBSE Live product
Class 10 (2026-27)
Chemical reactions and equations
Introduction to chemical reactions and balancing equations
7.
Chemical reactions
Question:
2
m.
Answer the following question:
Identification of chemical
reaction
i.
The main reason for cleaning the magnesium ribbon with sandpaper before burning is to:
Remove the oxide layer that prevents magnesium from reacting
Increase the surface area of magnesium
Prevent the formation of magnesium nitride
Remove the basic layer formed on magnesium
ii.
Magnesium burns with a dazzling white flame because:
Magnesium oxide is white in colour
It undergoes an exothermic reaction releasing a large amount of energy
Oxygen in air burns brightly
Magnesium vapours glow on heating
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